#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>

#define MAX_SIZE 1000

static unsigned short const wCRC16Table[256] = {
	0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
	0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
	0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
	0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
	0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
	0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
	0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
	0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
	0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
	0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
	0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
	0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
	0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
	0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
	0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
	0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
	0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
	0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
	0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
	0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
	0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
	0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
	0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
	0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
	0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
	0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
	0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
	0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
	0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
	0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
	0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
	0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 };


void CRC16(const unsigned char* pDataIn, int iLenIn, unsigned short* pCRCOut)
{
	unsigned short wResult = 0;
	unsigned short wTableNo = 0;
	int i = 0;
	for (i = 0; i < iLenIn; i++)
	{
		wTableNo = ((wResult & 0xff) ^ (pDataIn[i] & 0xff));
		wResult = ((wResult >> 8) & 0xff) ^ wCRC16Table[wTableNo];
	}

	*pCRCOut = wResult;
}


int set_opt(int,int,int,char,int);
int fd_adc = 0;

int getADC(){
    char buffer[20];
    memset(buffer,0, 20);
    int len=read(fd_adc,buffer,12);
    if(len == 0)
    {
        printf("ADC read error \n");
        return -1;
    }
    int value = atoi(buffer);
    value = value*10000/4096;
    return value;
}


void main()
{	
	int fd_uart,fd_file,nByte，fd_bz;

	// 设备地址
	char *uart3 = "/dev/ttySAC3";
	char *buzzer = "/dev/buzzer_ctl";
	char *IOtest = "./test.txt";
	char *uart_out = "hello Alan\n\r";

	char buffer_read[MAX_SIZE];

	// 打开设备
	if((fd_adc = open("/dev/adc", O_RDWR|O_NOCTTY|O_NDELAY))<0)
	{
		printf("open ADC error\n");
		return;
	}
	if((fd_bz = open(buzzer, O_RDWR|O_NOCTTY|O_NDELAY))<0)
	{
		printf("open buzzer error\n");
		return;
	}
	if( (fd_uart = open(uart3,O_RDWR))<0 )
	{
		printf("open %s is failed",uart3);
		return;
	}
	else
	{
	    // 初始化串口3
		set_opt(fd_uart,115200,8, 'N' ,1 );	
	
		unsigned char buffer_int[10] = {0};
		unsigned short crc16_result_10 = 0;
		
		while(1)
		{
			int i;
			for(i= 0; i< 10 ;i++)
				buffer_int[i] = 0;
				
			int value=getADC();
			value = value / 100;
			char *alert;

			if(value>90){
				alert="HI";
				buffer_int[2] = 72;
				buffer_int[3] = 73;
				ioctl(fd_bz,1);		// 蜂鸣器响
				sleep(1);

			}
			else if(value <10)
			{
				alert="LO";
				buffer_int[2] = 76;
				buffer_int[3] = 79;
				ioctl(fd_bz,1);		// 蜂鸣器响
				sleep(1);
			}
			else 
			{
				alert="OK";
				buffer_int[2] = 79;  
				buffer_int[3] = 75;
				ioctl(fd_bz,0);      // 蜂鸣器停
			}
			
			buffer_int[0] = 1;
		    buffer_int[1] = 2;

		    CRC16(buffer_int,4,&crc16_result_10);

		    //printf("%d %d %d %d \r\n",buffer_int[0],buffer_int[1],buffer_int[2],buffer_int[3]);
			//printf("crc16_result_10_d = %d\r\n", crc16_result_10);
			//printf("crc16_result_10_x = %04X\r\n", crc16_result_10);
			buffer_int[4] = crc16_result_10 >> 8;  // 右移8位，取高位
			buffer_int[5] = crc16_result_10;       // 取低位，这里的buffer_int为8位，crc16_result_10为16位，默认低位相等

			write(fd_uart, buffer_int, 6);
			usleep(500000);
			
			for(i= 0; i< 10 ;i++)
				buffer_int[i] = 0;
			buffer_int[0] = 0;
			buffer_int[1] = 1;
			buffer_int[2] = value;
			CRC16(buffer_int,3,&crc16_result_10);
			buffer_int[4] = crc16_result_10;
		    buffer_int[3] = crc16_result_10 >> 8;
		    //sprintf(buffer,"%02x %02x\r\n",1,value);
			write(fd_uart, buffer_int,5);
			usleep(500000);
		}
	}
}

/************************************
//串口设置
***********************************/
int set_opt(int fd_uart,int nSpeed, int nBits, char nEvent, int nStop)
{
	struct termios newtio,oldtio;
	if  ( tcgetattr( fd_uart,&oldtio)  !=  0) { 
		perror("SetupSerial 1");
		return -1;
	}
	bzero( &newtio, sizeof( newtio ) );
	newtio.c_cflag  |=  CLOCAL | CREAD;
	newtio.c_cflag &= ~CSIZE;

	switch( nBits )
	{
		case 7:
			newtio.c_cflag |= CS7;
			break;
		case 8:
			newtio.c_cflag |= CS8;
			break;
	}

	switch( nEvent )
	{
	case 'O':
		newtio.c_cflag |= PARENB;
		newtio.c_cflag |= PARODD;
		newtio.c_iflag |= (INPCK | ISTRIP);
		break;
	case 'E': 
		newtio.c_iflag |= (INPCK | ISTRIP);
		newtio.c_cflag |= PARENB;
		newtio.c_cflag &= ~PARODD;
		break;
	case 'N':  
		newtio.c_cflag &= ~PARENB;
		break;
	}

	switch( nSpeed )
	{
		case 2400:
			cfsetispeed(&newtio, B2400);
			cfsetospeed(&newtio, B2400);
			break;
		case 4800:
			cfsetispeed(&newtio, B4800);
			cfsetospeed(&newtio, B4800);
			break;
		case 9600:
			cfsetispeed(&newtio, B9600);
			cfsetospeed(&newtio, B9600);
			break;
		case 115200:
			cfsetispeed(&newtio, B115200);
			cfsetospeed(&newtio, B115200);
			break;
		case 460800:
			cfsetispeed(&newtio, B460800);
			cfsetospeed(&newtio, B460800);
			break;
		default:
			cfsetispeed(&newtio, B9600);
			cfsetospeed(&newtio, B9600);
			break;
	}
	if( nStop == 1 )
		newtio.c_cflag &=  ~CSTOPB;
	else if ( nStop == 2 )
		newtio.c_cflag |=  CSTOPB;
		newtio.c_cc[VTIME]  = 0;
		newtio.c_cc[VMIN] = 0;
		tcflush(fd_uart,TCIFLUSH);
	if((tcsetattr(fd_uart,TCSANOW,&newtio))!=0)
	{
		perror("com set error");
		return -1;
	}
	
	//	printf("set done!\n\r");
	return 0;
}


